Yes you can do that only in the Desktop installed program using Forms Mode. There is no question and answer steps for it. You can assign a third party designee in the desktop version of TurboTax in the Info Worksheet in Forms mode.
This post has a screen shot
https://ttlc.intuit.com/questions/3067044-how-do-i-add-allow-another-person-to-speak-with-irs
